Principles of human physiology, with their chief applications to pathology, hygiene, and forensic medicine : especially designed for the use of students / by William B. Carpenter.

  • William Benjamin Carpenter
Date:
1844
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Licence: Public Domain Mark

Credit: Principles of human physiology, with their chief applications to pathology, hygiene, and forensic medicine : especially designed for the use of students / by William B. Carpenter. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    17. 22. 23. 24. to be commencing the same kind of evolution. In the centre of the original nucleus, a pellucid spot, the nucleolus of Schwann and Schleiden, is observed (§ 745). Ovum from the Uterus, measuring about l-68th of an inch in diameter: a, pair of cells now occupying the greater part of the germinal vesicle b; c, zona pellucida : d, chorion, a new envelope, separated from the last by the fluid it has absorbed (§ 746). Ovum, of which the essential part> a, the pair of cells occupying the germinal vesicle, has advanced further than in the last case; the other contents of the germinal vesicle have undergone liquefaction. The chorion is here incipient; and the remains of the cells of which it is composed are seen at clio (§ 747). More advanced ovum; the cavity of the germinal vesicle filled with cells, a, that have originated in the two represented in the last figure ; these cells have nuclei, b, which are undergoing a corresponding process of evolution into secondary cells ; c and d as in Fig. 13 (§ 758). Ovum in a state rather more advanced; a, central cell of the germinal mass, now come to the surface, and showing the nucleus b with a pellucid centre, from which most of the embryonic structures are developed ; c, cavity in the germinal mass, caused by the approach of its peripheral cells to the enclosing membrane, d Formation of the Membrana Decidua; a, a, a, villi of the mucous membrane of the uterus ; b, substance secreted between and upon these ; c, uterine vessels prolonged into the decidua and forming loops. After Baer. Human Spermatozoa; a, seminal granules. After Wagner (§ 735). Cyst of evolution. After Wagner (§ 735). Capsular bundle of Spermatozoa, just previous to their separation. After Wagner (§735). Globules from the Chyle; a, ordinary globules; b, a globule (cytoblast ]) surrounding itself with an envelope (a forming cell ?) ; c, minute molecules of chyle; d, a colourless corpuscle from the blood. After Wagner (§ 563). Particles of Blood undergoing multiplication: a, b, c, d, e, successive stages. After Barry (§ 576). Extremity of one of the tufts of foetal vessels forming the Placenta; this includes (like a branchial tuft) an artery and vein. After Reid (§ 749). Plan of the structure of the Placenta, according to Dr. J. Eeid's view of it; a, a, portion of substance of uterus; b, b, b, b, section of uterine sinuses, some of them opening on the inner surface into the cavity of the placenta; c, curling artery of uterus; d, d, ramifications of foetal vessels, some of them sending down prolonged tufts which dip into the uterine sinuses (§ 749). PLATE II. 25. Uterine Ovum of Babbit, showing the Area Pellucida, with the annular nucleus of the embryonic cell (Fig. 14, b) now elongated. In the clear space enclosed by this is a well-marked dark groove, occupying the position in which the nervous centres are subsequently to be developed. The cephalic extremity of this is already rounded and the caudal extremity pointed. After Bischoff (§ 760).